A method for transmitting or receiving a frame by a STA in a WLAN according to one embodiment of the present invention may comprise the steps of: receiving a first frame including a PHY header and an A-PHDU obtained by aggregating PHDUs which are PHY data transmission units for a HARQ process; decoding at least one PHDU for the STA in the A-PHDU on the basis of the PHY header; and transmitting a second frame including ACK/NACK information on each of the at least one PHDU for the STA, according to a decoding result, wherein a CRC is individually provided to each of the PHDUs included in the A-PHDU, and the STA transmits a NACK through the second frame in relation to a particular PHDU for which a CRC failure has occurred during the decoding of the particular PHDU.
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5. The method of claim 1, wherein each of the PPDUs comprised in the A-PPDU corresponds to part of one PHY service data unit (PSDU).
This invention relates to wireless communication systems, specifically to methods for transmitting aggregated physical layer protocol data units (A-PPDUs) in a manner that improves efficiency and reliability. The problem addressed is the need to transmit large amounts of data in a fragmented yet coherent way, ensuring that each fragment (PPDU) corresponds to a portion of a single PHY service data unit (PSDU). This approach allows for better error handling and retransmission of only the affected fragments, rather than the entire data unit. The method involves constructing an A-PPDU composed of multiple PPDUs, where each PPDU contains a distinct segment of a single PSDU. This segmentation ensures that the data remains logically intact while being physically divided for transmission. The system may include mechanisms to track which PPDUs belong to which PSDU, allowing for efficient reassembly at the receiver. Additionally, the method may support features like error detection and retransmission of only the corrupted PPDUs, reducing unnecessary data retransmission and improving overall throughput. The invention is particularly useful in high-speed wireless networks where data integrity and transmission efficiency are critical. By segmenting the PSDU into smaller PPDUs, the system can adapt to varying channel conditions, retransmitting only the affected fragments rather than the entire data unit. This approach enhances reliability and reduces latency in data transmission.
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June 27, 2018
November 22, 2022
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